"A smile doesn't always mean a person is happy, sometimes.it simply means they are strong enough to face their problems." Jiraiya, Yahiko, and Itachi died qith a smile because they did what they could to help others!
I kind of understand how boruto felt.I mean his dad is alive but his not always there for his family. And how will boruto understand his father's hardships if he himself dosen't have time to talk about it to boruto. So I hope he would talk to his son